Please help asap what is 1+1

Solve the system of equations. y= 2x y= x^2 - 15

Which of the following represents the factorization of the trinomial below? x^2+7x-30

Consider an example of a deck of 52 cards: example set of 52 playing cards: 13 of each suit clubs, diamonds, hearts, and spades ace 2 3 4 5 6 7 8 9 10 jack queen king clubs diamonds hearts spades what is the probability of drawing three queens from a standard deck of cards, given that the first card drawn was a queen? assume that the cards are not replaced.